cpuGLVertexBuffer.h

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//
//   Copyright 2013 Pixar
//
//   Licensed under the Apache License, Version 2.0 (the "Apache License")
//   with the following modification; you may not use this file except in
//   compliance with the Apache License and the following modification to it:
//   Section 6. Trademarks. is deleted and replaced with:
//
//   6. Trademarks. This License does not grant permission to use the trade
//      names, trademarks, service marks, or product names of the Licensor
//      and its affiliates, except as required to comply with Section 4(c) of
//      the License and to reproduce the content of the NOTICE file.
//
//   You may obtain a copy of the Apache License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the Apache License with the above modification is
//   distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
//   KIND, either express or implied. See the Apache License for the specific
//   language governing permissions and limitations under the Apache License.
//

#ifndef OPENSUBDIV3_OSD_CPU_GL_VERTEX_BUFFER_H
#define OPENSUBDIV3_OSD_CPU_GL_VERTEX_BUFFER_H

#include "../version.h"

#include <cstddef>
#include "../osd/opengl.h"

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

namespace Osd {

class CpuGLVertexBuffer {
public:
    static CpuGLVertexBuffer * Create(int numElements, int numVertices,
                                      void *deviceContext = NULL);

    ~CpuGLVertexBuffer();

    void UpdateData(const float *src, int startVertex, int numVertices,
                    void *deviceContext = NULL);

    int GetNumElements() const;

    int GetNumVertices() const;

    float * BindCpuBuffer();

    GLuint BindVBO(void *deviceContext = NULL);

protected:
    CpuGLVertexBuffer(int numElements, int numVertices);

    bool allocate();

private:
    int _numElements;
    int _numVertices;
    GLuint _vbo;
    float *_cpuBuffer;
    bool _dataDirty;
};

}  // end namespace Osd

}  // end namespace OPENSUBDIV_VERSION
using namespace OPENSUBDIV_VERSION;

}  // end namespace OpenSubdiv

#endif  // OPENSUBDIV3_OSD_CPU_GL_VERTEX_BUFFER_H